CAT28F010
Signature Mode
WRITE OPERATIONS
An alternative method for reading device signature (see
Read Operations Signature Mode), is initiated by writing
the code 90H into the command register while keeping
VPP high. A read cycle from address 0000H with CE and
OE low (and WE high) will output the device signature.
The following operations are initiated by observing the
sequence specified in the Write Command Table.
Read Mode
The device can be put into a standard READ mode by
initiating a write cycle with 00H on the data bus. The
subsequent read cycles will be performed similar to a
standard EPROM or E2PROM Read.
CATALYST Code = 00110001 (31H)
A Read cycle from address 0001H retrieves the binary
code for the device on outputs I/O0 to I/O7.
28F010 Code = 1011 0100 (B4H)
Figure 4. A.C. Timing for Erase Operation
SETUP ERASE
COMMAND
ERASE
COMMAND
ERASING
ERASE VERIFY
COMMAND
ERASE
VERIFICATION
V
POWER-DOWN/
STANDBY
V
POWER-UP
CC
CC
& STANDBY
ADDRESSES
t
t
t
t
WC
WC
WC
RC
t
AS
t
AH
CE (E)
t
t
CH
CS
t
t
CH
EHQZ
t
t
CS
CH
OE (G)
t
GHWL
t
t
t
WHGL
DF
WHWH2
t
WPH
WE (W)
t
t
t
t
WP
WP
WP
OE
t
t
t
t
DH
DH
DH
OH
t
t
t
t
DS
DS
OLZ
DS
HIGH-Z
DATA IN
= 20H
DATA IN
= 20H
DATA IN
= A0H
DATA (I/O)
VALID
DATA OUT
t
LZ
t
CE
5.0V
0V
V
CC
t
VPEL
V
V
PPH
PPL
V
PP
28F010 F11
Doc. No. 25005-0A 2/98 F-1
9
CATALYST [ CATALYST SEMICONDUCTOR ]
